Hi,
Of you can get the .config file of Air , first you need to clone the source code from github:
#git clone https://github.com/friendlyarm/h3_lichee.git lichee
(Note: "lichee" is the project name named by Allwinner for its CPU's source code which contains the source code of U-boot, Linux kernel and various scripts. )
Then build the cross-compiler refer the steps of Air's wiki, If you want to compile the Linux kernel and configure the configuration just run the following command:
#cd h3_lichee
#cd linux-3.4.y (you can copy .config file directly)
#make menuconfig
#make